객관식
What is the most abundant anion in the extracellular fluid (ECF)?
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3. Chemical Reactions
Polyatomic Ions
객관식
What is the charge of the phosphate ion in K3PO4?
A
+3
B
-2
C
-1
D
-3
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검증된 단계별 안내1
Identify the chemical formula of the compound given: K3PO4, which consists of potassium (K) ions and phosphate (PO4) ions.
Recall that potassium (K) is an alkali metal that typically forms a +1 charge as an ion (K⁺).
Since there are 3 potassium ions, the total positive charge contributed by potassium is 3 × (+1) = +3.
The compound K3PO4 is electrically neutral overall, so the total negative charge from the phosphate ion must balance the +3 charge from potassium.
Set up the equation for charge balance: charge of phosphate ion + 3(+1) = 0, which means the charge of the phosphate ion is -3.
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